Geologic Time Scale 2004 – Why, How, and Where Next!

• Autorzy: Gradstein F. , Ogg J.
• Konferencja: International Congress on the Jurassic System (7 ; 06-18.09.2006 ; Kraków, Poland)
• Języki publikacji: EN

Abstrakty

EN

This lecture reviews Geologic Time Scale 2004 (Gradstein et al. 2004), constructed and detailed by 40 geoscience specialists, and indicates how it will be further refined. Since Geologic Time Scale 1989 by Harland et al. many developments have taken place: 1. Stratigraphic standardization through the work of the International Commission on Stratigraphy (ICS) has greatly refined the international chronostratigraphic scale. In some cases, traditional European-based stages have been replaced with new subdivisions that allow global correlation. 2. New or enhanced methods of extracting high-precision age assignments with more realistic uncertainties from the rock record. These have led to improved age assignments of key geologic stage boundaries and other global correlation horizons. 3. Orbital tuning has greatly refined the Neogene, and improved parts of Palaeogene and Mesozoic. 4. Statistical techniques of compiling integrated global stratigraphic scales within geologic periods. Anticipated advances to the Geologic Time Scale during the next 8 years include: • a geologically realistic Precambrian scale, and stages subdivision of the Ediacaran; • formal definition of all Phanerozoic stage boundaries; • orbital tuning of polarity chrons and biostratigraphic events for entire Cenozoic and Cretaceous; • a detailed database of high-resolution radiometric ages that includes “best practice” procedures, full error analysis, monitor ages and conversion; • resolving age dating controversies (e.g., zircon statistics and possible reworking) across Devonian/Carboniferous, Permian/Triassic, and Anisian/Ladinian boundaries; • improved and standardized dating of several “neglected” intervals (e.g., Upper Jurassic – Lower Cretaceous, and Carboniferous through Triassic); • detailed integrated stratigraphy for Upper Palaeozoic through Lower Mesozoic. The geochronological science community and ICS are focusing on these issues. A modified version of the time scale to accompany the standardization (boundary definitions and stratotypes) of all stages is planned for 2008 (to be presented at the 33th International Geologic Congress in Oslo), with a totally revised version of GTS available in 2012. At the same time ICS is closely working with the Commission for the Geological Map of the World (CGMW) to standardize stratigraphic nomenclature and the colour scheme for its units.

Słowa kluczowe

EN

Geological Time Scale 2004; stratigraphy; ICS; geochronology

• Wydawca: Państwowy Instytut Geologiczny - Państwowy Instytut Badawczy
• Czasopismo: Volumina Jurassica
• Rocznik: 2006
• Tom: Vol. 4, no. 1
• Strony: 167--168
• Opis fizyczny: Bibliogr. 2 poz.

Twórcy

autor

Gradstein F.

autor

Ogg J.

• University of Oslo, Museum for Geology and Paleontology, Sars’ gate 1, N-0562 Oslo, Norway,

Bibliografia

• Gradstein F .M., Ogg J. G., Smith A. G., Agterberg F. P., Bleeker W., Cooper R. A., Davydov V., Gibbard P., Hinnov L., House M. R., Lourens L., Luterbacher H-P., McArthur J., Melchin M. J., Robb L. J., Shergold J., Villeneuve M., Wardlaw B. R., Ali J., Brinkhuis H., Hilgen F. J., Hooker J., Howarth R. J., Knoll A. H., Laskar J., Monechi S., Powell J., Plumb K. A., Raffi I., Rohl U., Sanfilippo A., Schmitz B., Shackleton N. J., Shields G. A., Strauss H., Van Dam J., Veizer J., van Kolfschoten Th. and Wilson D. 2004. A geologic time scale 2004. 500 pp. Cambridge University Press. UK.
• Harland W. B., Armstrong R. L., Cox A. V., Craig L. E., Smith A. G. and Smith D. G. 1990. A geologic time scale 1989. 263 pp. Cambridge University Press. UK.